According to MLB.com’s Gregor Chisholm, right-hander Brandon Morrow suffered a minor setback Monday during his rehab debut with High-A Dunedin and has been sent back to Toronto to have his ailing forearm examined by the Blue Jays’ team doctors.

Morrow was placed on the 15-day disabled list on May 29 with a strained right forearm. The former top prospect had a rough 5.63 ERA and 1.49 WHIP in 64 1/3 innings this season before landing on the shelf.